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violet vs purple vs ultraviolet

Are violet and purple exactly same? Do they refer to the same color?
I thought "ultraviolet" means the color outside of violet in the rainbow colors as "ultra" means "over" or "exceeding" or "beyond". Where is "ultraviolet" from?

spectral colors violet and indigo are not purples according to color theory but they are purples according to common English usage since they are between red and blue.

Violet is a spectral color (approximately 380–420 nm), of a shorter wavelength than blue, while purple is a combination of red and blue or violet light.[10] The purples are colors that are not spectral colors – purples are extra-spectral colors. In fact, purple was not present on Newton's color wheel (which went directly from violet to red), though it is on modern ones, between red and violet. There is no such thing as the "wavelength of purple light"; it only exists as a combination.

Re: violet vs purple vs ultraviolet

Don't you think "ultraviolet"'s "violet" means the last color in the spectrum? The order of the spectrum is "Red, Orange, Yellow, Green, Blue, Indigo, Violet" and that's why "infrared" is the outside of "red" while "ultraviolet" is the outside of "violet".

But the thing is that in Korean, "violet" in rainbow colors is replaced by "purple", and "ultraviolet"'s "violet" is translated as purple, so I was wondering if the two are interchangeable, or Koreans made a mistake in translation.

Re: violet vs purple vs ultraviolet

Yes, "violet" is the proper term for the color in the spectrum. If you have something translated that says there is "purple" after blue and indigo, then it's wrong. If you have something translated that there is something known as "ultrapurple" light, then it's really wrong.

Many people, in common everyday English, will refer to violet or indigo as "purple." It sounds like it is the same in Korean. But if talking about the spectrum of light, use "violet."

Re: violet vs purple vs ultraviolet

I think the confusion over the difference between "purple" and "violet" comes from their similarity. When I searched them on the net and tried to tell them, I couldn't do well. They looked quite similar!!!